The CAS Registry Mumber 197500-50-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,7,5,0 and 0 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 197500-50: (8*1)+(7*9)+(6*7)+(5*5)+(4*0)+(3*0)+(2*5)+(1*0)=148 148 % 10 = 8 So 197500-50-8 is a valid CAS Registry Number.
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